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First, this is very dangerous. You could Brick your phone. 'Brick' means that it can never work again. I'd suggest that you have someone who has done this before perform the install. This is not a program that you can just click on and download to your phone. This is a complicated step-by-step process.

Below is the link for the Windows Mobile 6.5 Software for your HTC P3400. You'll have to sign up at the website to become a member, then you can download the update by clicking on "free-software-download-htc-p3400i-windows-mobile-6-5.rar"

Jayshree, just do 1 thing. after installing the themes files be sure to keep the respective files in your My Device/Windows folder, were the existing themes files kept.Now tap on start\setting\today u will get the theme list.njoy!